Qtplasmac with proma thc 150 Z axis up and down too quick!

Thank you for your help always...!
Here some examples of plasma cnc working. Don´t know how put videos, i show you some images.
Machine was made here in Portugal! by us, with support of you in this forum and linuxcnc.org and youtube...
I think this machine in last 3 months, have cutted almost 6 tons

Very thanks

There is a limit we can do to help you with the Proma 150 you are using. Tommy here is probably the most experienced with them.
eusurplus is also in Portugal. I suggest you contact them and upgrade to a Mesa card with a THCAD and replace the proma. (I don't think Tommy has used a Proma for years)

I'm glad someone else wants to make probing as fast as possible. It can be done!
Here is a super short video I did

What is the Proma set to?
You can try raising the DV on the proma a bit.
For normal use all the values should be at their minimum, except the ArcOK voltage.
Been a while... i think it does +-1V min, so raise that to 2 or 3 and do some tests.
Sorry i did not recal this earlier, Rod just reminded me, thank you.

Thank you Rod
We have seen Mesa cards and THCAD system.
In first place we were prepared to equip this machine using UCCNC AXBB-E board with proma thc 150.
Then after some research we discover linuxcnc and this forum after my first build and no longer left linuxcnc.
So we bought proma thc and conect to a lpt board but yes maybe you are right in a industrial environment and near future we will upgrade to mesa card with Thcad system.

Also try to upgrade to a non hf plasma to take advantage of omic probes like in your video since HF Plasma and omic probes are not friends i guess.

Hi Tommy
I have start with standart parameters wroten in a post by you i guess.
HYS - 2
d-t - We made a table and change with the thikness of the material so between 125 - 150, 4mm - 20mm
H-U - 200v

Know after your advise we change P value on qtplasmac between 10% and 3% acording to thikness of material 4mm - 20mm.

Overall the system cut's very well, we had some stress with a manual torche atached on the z axis, left working to cut some rectangles for about 10 minutes and when come back the torche was literaly on fire!!! image missing /media/kunena/emoticons/shocked.png 

Because all were inside warranty, the suplier change the torche to Autocut A 101P, then fine tune parameters again to all thikness of material and after your advise to tweek % of pid value, boom, done.


 

RRicardo wrote:

Hi Tommy
I have start with standart parameters wroten in a post by you i guess.
HYS - 2
d-t - We made a table and change with the thikness of the material so between 125 - 150, 4mm - 20mm
H-U - 200v

HYS is the Hysteresis in Volts, 2 meaning a change of under 2V will not move the torch, so raise this to 3 or 4 or 5 and do some tests. For thin material, always 2.
D-T is the delta time, or the time for the torch to react after the voltage has changed above the HYS value, i would set this to minimum for sure.
H-U is H-V in reality but the screen can not do V, that is the upper voltage limit for sending a ARCOK signal, and this depends on plasma source used a lot, usually 150 to 200 works fine, so leave it at 200.